Had an Astra on my team my last game that after we were down 3-6, says “we have no chance” and started to sit in spawn and sabotage our whole team with her abilities (ex. Smoking off our sights, concussing teammates, pulling us off the bomb...

I do well in deathmatches and hard mode bots but I can't consistently kill people ADAD shooting, how do I practice this efficiently? Sometimes I feel I don't have enough reaction time or I just don't know where to shoot because the enemy is...